Custom Portland Home Additions

A 500 square foot addition in Portland typically costs between $175,000 and $300,000, depending on structural complexity, finish level, and utility integration.

Kitchen and bathroom additions trend toward the higher end due to plumbing and cabinetry costs.

Building out is often less expensive structurally, but it requires adequate lot space and setback compliance. Building up (adding a second story) avoids expanding the footprint but requires significant structural reinforcement. The most cost-effective option depends on lot size, foundation capacity, and zoning.

From design through construction, most home additions take 6 to 12 months. Permitting alone can take several weeks to a few months, depending on project complexity and city workload.

A home addition expands your existing home and shares utilities and living space. An ADU (Accessory Dwelling Unit) is a separate, self-contained living unit with its own kitchen and bathroom. Portland has specific zoning regulations governing ADUs.

Yes. Well-designed home additions often increase resale value, especially when adding bedrooms, bathrooms, or expanding kitchens. Return on investment depends on neighborhood market conditions and project quality.

In many cases, yes. However, for large structural projects like second-story additions, temporary relocation may be recommended for safety and efficiency.

Lamont Bros. provides custom home additions throughout Portland, including neighborhoods such as Alameda, Alberta Arts District, Arbor Lodge, Beaumont-Wilshire, Boise, Brentwood-Darlington, Brooklyn, Buckman, Concordia, Creston-Kenilworth, Eastmoreland, Forest Heights, Goose Hollow, Grant Park, Hawthorne, Hillsdale, Irvington, Laurelhurst, Lents, Maplewood, Montavilla, Multnomah Village, Nob Hill, Overlook, Pearl District, Richmond, Sellwood-Moreland, St. Johns, Sunnyside, University Park, West Hills, and Woodstock.

In addition to serving Portland neighborhoods, we also complete home additions in surrounding areas including Beaverton, Lake Oswego, West Linn, Tigard, Tualatin, Milwaukie, Happy Valley, and other nearby communities throughout the greater Portland metro area.